eyeglasses in the image, 51-18-143, represents the frame measurements in millimeters.
These numbers correspond to three key dimensions: lens width, bridge width, and temple length.
Understanding the Measurements
* 51 (Lens Width): This is the horizontal width of one lens at its widest point. It’s measured in millimeters and indicates the size of the lens itself.
* 18 (Bridge Width): This number refers to the distance between the two lenses—the part of the frame that rests on your nose. This is also measured in millimeters.
* 143 (Temple Length): This is the length of the arm piece (the “temple”) that extends from the frame’s hinge to the end that rests behind your ear. It’s also measured in millimeters.
These measurements help ensure the eyeglasses fit comfortably and securely on your face.
When shopping for new glasses, knowing these numbers can help you find a pair with a similar fit to your current ones.




















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